This document contains the questions for a 4th semester B.Tech degree examination in Object Oriented Design and Programming. It covers topics like arrays, polymorphism, access control, object orientation concepts, UML diagrams, constructors, looping statements, abstract classes, packages, threads, exceptions, dynamic method dispatch, delegation event model, Swing, applets, String class methods, AWT controls, and database connectivity. Students have to answer questions in 5 parts (A-E) covering concepts, writing code snippets, and programs.

1. Fourth Semester B.Tech Degree Examination
CS206 Object Oriented Design and Programming
Time: 3 Hours Max. Marks: 100
PART-A
Answer all questions. Each question carries 3 marks.
1. Explain the declaration of array variable in Java. What is dynamic initialization? Give
examples.
2. What is meant by polymorphism? Briefly explain the types of polymorphism.
3. What is the output of the following code? Justify.
class Test {
public static void main(String a[]) {
byte b = 50;
b = b * 2;
System.out.print(b);
}
}
4. Write a note on the access control keywords in Java.
PART-B
Answer any two full questions. Each question carries 9 marks.
5. a) Explain object orientation concepts briefly. (6)
b) Explain overloading in Java, with example. (3)
6. a) List the graphical diagrams defined by UML and illustrate with examples. (4)
b) Explain parameter passing in Java, with suitable examples. (5)
7. a) Describe the use of constructor in Java, with suitable examples. (4)
b) Describe the looping control statements in Java, with examples. (5)
PART-C
Answer all questions. Each question carries 3 marks.
8. Describe the use of abstract class in Java.
9. Explain the use of packages in Java.
10.Write a note on stream related classes.
11. What is thread synchronization?
PART-D
Answer any two full questions. Each question carries 9 marks.
12.a) Explain how multiple threads are created in a program, with example. (5)
b) Write a Java program that accepts N integers through console and sort them in
ascending order. (4)
13.a) Explain exception handling mechanism, with suitable examples. (5)
b) Write a Java program that counts the number of words in a text file. (4)
14.a) What is dynamic method despatch? Give examples. (4)
b) Write a program to create a package named mypack, containing a class
RightTriangle in which a static method check whether three given sides of a triangle
forms a right-angled triangle and returns that information. Import this package in
another class. (5)

2. PART-E
Answer any four full questions. Each question carries 10 marks.
15.a) Explain delegation event model. (5)
b) Explain how dynamic queries are executed in Java? (5)
16.a) Define swing. What are the advantages of swing over AWT components? (4)
b) Explain type of statements in Java. Give examples. (6)
17.a) Describe the architecture of applet. (4)
b) Explain the steps in connecting java program to database, with example. (6)
18.a) List any five methods of String class, give examples. (3)
b) Write an applet that simulates a desk calculator, using AWT controls and event
handling. It accepts two numbers from the user and performs computation(+, -, *, /)
based on the choice and displays the result. (7)
19.a) Write an applet which displays the x-y coordinates of mouse, when it is clicked. Use
event handling mechanism. (6)
b) Explain the use of graphics class in Java. (4)
20.a) How parameters are passed to an applet? (3)
b) A table named Student exists with fields name, roll-no and marks for 3 subjects
(mark1, mark2, mark3). Write a Java program to prepare a rank list (name, roll-no) of the
students based on total marks and displays the same. (7)